package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import jakarta.servlet.ServletOutputStream;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * ClassName: ReportServiceImpl
 * Description:
 *
 * @Author HL
 * @Create 2024/5/30 16:51
 * @Version 1.0
 */
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;
    
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //当前集合用于存放从begin到end范围内的每天的营业额
        List<Double> turnoverList = new ArrayList<>();
        for(LocalDate date : dateList){
            //查询date日期对应的营业额数据，营业额是指：状态为“已完成”的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //select sum(amount) from orders where order_time > ? and order_time < ? and status = 5
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover ==  null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        //封装返回结果
        String date_list = StringUtils.join(dateList, ",");
        String turnover_list = StringUtils.join(turnoverList, ",");
        return new TurnoverReportVO(date_list, turnover_list);
    }

    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //当前集合用于存放从begin到end范围内的每天新增用户数量
        //select count(id) from user where create_time < ? and create_time > ?
        List<Integer> newUserList = new ArrayList<>();
        //当前集合用于存放从begin到end范围内的每天总用户数量
        //select count(id) from user where create_time < ?
        List<Integer> totalUserList = new ArrayList<>();

        for(LocalDate date : dateList){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end", endTime);
            //总用户数量
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin", beginTime);
            //新增用户数量
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        //封装返回结果
        String date_list = StringUtils.join(dateList, ",");
        String totalUser_list = StringUtils.join(totalUserList, ",");
        String newUser_list = StringUtils.join(newUserList, ",");
        return new UserReportVO(date_list, totalUser_list, newUser_list);
    }


    /**
     * 根据条件统计订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status){
        Map map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);

        return orderMapper.countByMap(map);
    }
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //当前集合用于存放从begin到end范围内的每天订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //当前集合用于存放从begin到end范围内的每天有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();
        //遍历dateList集合，查询每天的有效订单数和订单总数
        for(LocalDate date : dateList){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //查询每天的订单总数
            //select count(id) from orders where order_time > ? and order_time < ?
            Integer orderCount = getOrderCount(beginTime, endTime, null);

            //查询每天的有效订单数
            //select count(id) from orders where order_time > ? and order_time < ? and status = 5
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        //计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0){
            //计算订单完成率
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        //封装返回结果
        String date_list = StringUtils.join(dateList, ",");
        String orderCount_list = StringUtils.join(orderCountList, ",");
        String validOrderCount_list = StringUtils.join(validOrderCountList, ",");
        return new OrderReportVO(date_list, orderCount_list, validOrderCount_list, totalOrderCount, validOrderCount, orderCompletionRate);
    }

    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        //封装返回结果
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");
        return new SalesTop10ReportVO(nameList, numberList);
    }

    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1. 查询数据库，获取营业数据 --- 查询最近30天的数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        LocalDateTime begin = LocalDateTime.of(dateBegin, LocalTime.MIN);
        LocalDateTime end = LocalDateTime.of(dateEnd, LocalTime.MAX);
        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(begin, end);

        //2. 通过POI将数据写入到excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("templates/运营数据报表模板.xlsx");
        //基于模板文件创建一个新的Excel文件
        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据 -- 时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);
            //填充数据 -- 概览数据
            XSSFRow row1 = sheet.getRow(3);
            row1.getCell(2).setCellValue(businessDataVO.getTurnover());
            row1.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row1.getCell(6).setCellValue(businessDataVO.getNewUsers());
            XSSFRow row2 = sheet.getRow(4);
            row2.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row2.getCell(4).setCellValue(businessDataVO.getUnitPrice());
            //填充数据 -- 明细数据
            for(int i = 0; i < 30; ++i){
                LocalDate date = dateBegin.plusDays(i);
                LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
                LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(beginTime, endTime);
                XSSFRow row = sheet.getRow(i + 7);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
